MoDisco

Legacy systems embrace a large number of technologies, making the
development of tools to cope with legacy systems evolution a tedious and
time consuming task. As modernization projects face with both
technologies combination and various modernization situations,
model-driven approaches and tools offer the requisite abstraction level
to build up mature and flexible modernization solutions.

It is very complete and notably includes a full description of the MoDisco approach and framework + examples of practical use in the context of real industrial scenarios.
Get it from there and enjoy the reading!